DeclarationJoinLinesHandler: more careful precedence fix (IDEA-CR-34859)

java/java-tests/testData/codeInsight/joinLines/AssignmentExpressionPrecedence.java

@@ -0,0 +1,6 @@
+class Foo {
+    {
+        int a = 1 + 2<caret>;
+        a *= 2 + 3;
+    }
+}

java/java-tests/testData/codeInsight/joinLines/AssignmentExpressionPrecedence2.java

@@ -0,0 +1,6 @@
+class Foo {
+    {
+        int a = 1 + 2<caret>;
+        a -= 2 + 3;
+    }
+}

java/java-tests/testData/codeInsight/joinLines/AssignmentExpressionPrecedence2_after.java

@@ -0,0 +1,5 @@
+class Foo {
+    {
+        int a = 1 + 2 - (2 + 3);
+    }
+}

java/java-tests/testData/codeInsight/joinLines/AssignmentExpressionPrecedence_after.java

@@ -0,0 +1,5 @@
+class Foo {
+    {
+        int a = (1 + 2) * (2 + 3);
+    }
+}